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Why is my sub way louder when my trunk is open?

 

New member
Username: Purplehase_bong

Bc Canada

Post Number: 7
Registered: Apr-04
i got a ported box now and my bass is way louder when i sit in the front with the trunk open.! wat is wrong :-( i need to know because im getting really pissed off.!
 

Silver Member
Username: Its_bacon12

Post Number: 408
Registered: Dec-03
which way is your sub facing? that is what will make the difference
 

New member
Username: Purplehase_bong

Bc Canada

Post Number: 8
Registered: Apr-04
its facing the trunk.!
 

markd
Unregistered guest
this may help:
http://www.teamrocs.com/technical/pages/trunk.htm
 

Bronze Member
Username: Randy420

Post Number: 27
Registered: Dec-03
this will help too..

http://www.crutchfield.com/tech/kb332.html
 

Silver Member
Username: Its_bacon12

Post Number: 430
Registered: Dec-03
is it facing towards the cabin or towards the bumper?
 

New member
Username: Purplehase_bong

Bc Canada

Post Number: 10
Registered: Apr-04
bumper!
 

Silver Member
Username: Its_bacon12

Post Number: 433
Registered: Dec-03
try facing it towards the side of the car....

...
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 1981
Registered: Dec-03
try venting the rear deck.
 

Bronze Member
Username: Koveaudio

Post Number: 32
Registered: Mar-04
my friend has a 97 neona dn just put two memphis power reference 12s in teh back in a slot ported box, and it sounds fine in the cabin of the car.
 

Bronze Member
Username: Purplehase_bong

Bc Canada

Post Number: 11
Registered: Apr-04
i turned the sub sideways and tuned the box to 35hz and now it pumps so nice.! itll kill rf HE2's
 

Bronze Member
Username: Purplehase_bong

Bc Canada

Post Number: 12
Registered: Apr-04
i turned the sub sideways and tuned the box to 35hz and now it pumps so nice.! itll kill rf HE2's
 

mab
Unregistered guest
because subwoofers are not realy made for musical volume there made to make you feel the bass and hear the bass a little
 

Bronze Member
Username: Purplehase_bong

Bc Canada

Post Number: 14
Registered: Apr-04
lmao i aint talking about musical volume. im talking about the bass and how deep it goes
 

New member
Username: Justinfannin

Post Number: 1
Registered: Apr-04
I've got a 15" Audiobahn High Excursion Sub, 800watts RMS, 130 oz magnent. I was wandering what kind of Amp am I going to need. Thanks
 

Bronze Member
Username: Southernrebel

Louisiana USA

Post Number: 23
Registered: Mar-04
it all has the do w/ the cabin gain issue...

i dont know if anyone has ever really figured out any formula or anything to explain the "open-trunk effect"

all i know is that you can get usually get higher SPL w/ open windows and trunks...i know my L5 is alot louder w/ the windows down...

i guess the atmospheric pressure in the cabin is greater w/ window up and trunks closed...so when you open trunks or roll down windows the pressure changes and sound wave travel differently...????maybe???
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 2036
Registered: Dec-03
you're on the right track, and yes there are fomulas to figure this stuff out.
essentially to simplify this, look at it this way:
the subwoofer(s), sitting in a box use the small enclosure behind the speaker as a volume of air to compress. the air in front of the speaker (in the trunk or cabin of the car) acts in much the same way, turning the entire car more or less into the "front" chamber of a dual chamber enclosure.
When you open the trunk, or the windows, you alter that air volume, and thus drastically affect the reaction of the driver to the air volume.
it's like taking a sub in a bandpass box, and suddenly removing the front portion of the box, then noting the change in performance when you suddenly have a ported box instead of a bandpass.
That's over-simplified, but that's what's happening, in a nutshell.
 

Bronze Member
Username: Southernrebel

Louisiana USA

Post Number: 26
Registered: Mar-04
bout what i figured....


i just knew it was a little bit more complex....lol


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